@gemlog Pretty cool, right? It may seem totally random, almost free jazz-like, but while it is heavily based on improvisation, it's structured at the same time. On studio album they even employ editing techniques available at that time — tape loops and such. Wider lineup also had more instumentalists that allowed for some interesting stereo effects. And live versions off Miles Davis at Fillmore are just amazing!
I love the whole late 60-ies early 70-ies period of his career!